Research On Multi User Searchable Encryption Scheme With Attribute Revocation In Cloud Storage

In the attribute based encryption scheme,the user's attributes are embeds into the private hey,Through the establishment of access structure associated with certain attributes,only those asers who have the attributes satisfy the access structure can decrypt the ciphertext.This method is used to distinguish access rights between different users.The revocable attribute based encryption scheme can realize the timely change of user attributes.The user can only have the access rights of the updated attributes.Multi-user searchable encryption scheme is used to implement the user's secret search process by establishing the keywords index.Establish an encryption scheme which can not only support searchable encryption scheme,but also realize the timely change of user attributes become a valuable research topic.In this paper,we study the multi-user searchable encryption scheme with attribute revocation fur cloud storage and achieve the following results.1?We propose an efficient multi user searchable encryption scheme with attribute revocation and grant in cloud storage.The scheme is based on an efficient searchable encryption scheme ands improved mainly from the three aspects:first,the addition of the user attribute revocation and grant function;second,through the improvement of the original search trapdoor,we can realize the multi-user keyword-based secret search process under the condition that the cloud server is not trusted,and guarantee the security of information;third,through the use of lazy update technology to avoid frequent updates of the user private key.Finally,the security of scheme is proved.2?An efficient attribute based encryption scheme is proposed to support the user's attribute revocation and keyword search.The scheme is improved on the basis of the classical attribute based encryption scheme,and has the following characteristics:first,the user attributes and access rights can be timely updates;second,support multi-user secret searchable encryption process;third,the user's private key does not need to update when the user's attribute changes.Fourth,there is no need to update the ciphertext in the process of changing user attributes and access rights,thereby improving the efficiency of the scheme.Finally,the security of the scheme is proved.